Zac Efron With Brittany Snow in 2013

Zac Efron Reconnects With Old Friend Brittany Snow Postrehab

Zac Efron reunited with his old friend Brittany Snow to attend the Los AngelesHaunted Hayride together last night. Derek and Julianne Hough also joined in on the fun, as well as Adam Shankman. Zac wrapped his arm around his former Hairspray costar as they walked to the event. While the two looked cozy, the outing was most likely purely platonic as, last we heard, Brittany was still dating Teen Wolf star Tyler Hoechlin. Plus, Brittany and Zac have been close friends for many years, ever since they starred in 2007's Hairspray together.

Back in September, reports emerged that Zac had completed a stint in rehab for an addiction problem earlier this year. He kept his struggles a secret for awhile, including when he promoted his latest flick, Parkland, at the Toronto International Film Festival last month. While Zac hasn't openly talked about his addiction issues, he did hint that the rehab reports were at least partially true when he thanked fans for their support on Instagram.